#include <errno.h>
#include <stdarg.h>
#include "ourhdr.h"

static void err_doit(int, const char*, va_list);

char* pname = NULL;		/* caller can set this from argv[0] */

/* Nonfatal error related to a system call
 * Print a message and return. */

void err_ret(const char* fmt, ...){
	va_list		ap;
	va_start(ap, fmt);
	err_doit(1, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error related to a system call
 * Print a message and terminate. */

void err_sys(const char* fmt, ...){
	va_list ap;
	va_start(ap, fmt);
	err_doit(1, fmt, ap);
	va_end(ap);
	exit(1);
}

/* Fatal error related to a system call.
 * Print a message, core dump, and terminate. */

void err_dump(const char* fmt, ...){
	va_list ap;
	va_start(ap, fmt);
	err_doit(1, fmt, ap);
	va_end(ap);
	abort();
	exit(1);
}

/* Nonfatal error unrelated to a system call.
 * Print a message and return. */

void err_msg(const char* fmt, ...){
	va_list ap;
	va_start(ap, fmt);
	err_doit(0, fmt, ap);
	va_end(ap);
	return;
}

/* Fatal error unrelated to a system call.
 * Print a message and return. */

void err_quit(const char* fmt, ...){
	va_list ap;
	va_start(ap, fmt);
	err_doit(0, fmt, ap);
	va_end(ap);
	exit(1);
}

/* Print a message and return to caller.
 * Caller specifies	"errnoflag". */

static void err_doit(int errnoflag, const char* fmt, va_list ap){
	int		errno_save;
	char	buf[MAXLINE];

	errno_save = errno;
	vsprintf(buf, fmt, ap);
	if(errnoflag)
		sprintf(buf+strlen(buf), ": %s", strerror(errno_save));
	strcat(buf, "\n");
	fflush(stdout);
	fputs(buf, stderr);
	fflush(NULL);
	return;
}














